In 1974, science fiction writer Arthur C. Clarke told a reporter from the Australian Broadcasting Corporation what computer use would be like in the year 2001. At the time, the technology to link one computer to the next was in its infancy. Clarke could see possibilities far ahead of ability. -via Geeks Are Sexy

Clarke may not have been predicting future technology, but I think he was predicting future society, culture and human behavior. Just because a technology exists, doesn't necessarily mean society will adopt it.